Hi @tedmiston, I tought too that the Vue team was working on it, but they're clearly focusing on integrating Weex with Vue right now.
In comparison of Next.js, Nuxt.js is customizable via a nuxt.config.js file, I am actually working on the possibility to extend the root application via a pages/_app.vue file. This way, there are endless possibilities for customizing your app.
I'm actually working on an E-commerce website based on nuxt.js, it's a big enough example to know if nuxt.js is ready for making any kind of web application.
Also, for the server-side, you can use nuxt.js as a middleware of your own node.js app.